Locomotive smoke box



Inven'ov: WlamL. Bean Aug. 23, 1927.

lll

Patented Aug. 23, 1927.

Unirse STATES WILLIAM: L. BEAN, 0F WEST HAVEN, CDNNECTICUT.

LOCOMOTIVE SMOKE BOX.

Original application filed March 5, 1925, Serial No. 13,242. Divided and this application i'led November 19, 1926. Serial No. 149,377.

This invention relates to locomotive smoke-box structures, and will be 'best understood by reference to the following description, when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

- In the drawings:

Fig. 1 is a central, vertical, longitudinal, sectional view of a portion of the lfront end of a locomotive, including the cylinder saddle and the smoke-box supported thereon; an

Fig. 2 is a sectional View on line 2-2 of Fig. 1, looking toward the rear.

Referring to the drawings, and to the embodiment of the invention which is selected for exempliication, and having reference more particularly to Fig. 1, the locomotive has a cylindersaddle 20, which presents a support for a sm-oke-box 21, the latter in the present example being a casting, as distinguished from a structure built up of sheet metal and other fabricated shapes.

The smoke-box is suitably secured to the cylinder saddle, as by bolts 29, having nuts 30 which are on the outside of the smokebox, Where they are not subject to the abrasive and corrosive action of the cinders-and products of combustion, and Where they are readily accessible for removal in case at any time it becomes necessary or desirable to remove the smoke-box from its seat on the cylinder saddle.

Because of the Wear and wasting away of the lower portion of the interior of the smoke-box, due to the abrasive and chemical action of the products of combustion, the smoke-box casting is thickened at its lower part Where the products of combustion travel along its internal surface on thelr Way toward the stack. This thickening of the circumferential Wall of the smoke-box at its lower portion also'gives it increased strength. This feature is well illustrated in Fig. 2, which showsv the smoke-box as having a circumferential wall 31, which has a gradually decreased thickness from its lower portion toward, its vupper portion. Herein, that portion of the wall which is above a horizontal plane containing the axis j of the smoke-box is of uniform thicknessy A(subject to exceptions hereinafter noted),

wall.

while that portion which is below said plane is gradually thickened, and reaches its maximum thickness at the veryA bottom, at a vertical plane which contains said axis. In the present example, it is found convenient to make both of thesesurfaces cylindrical, and slightly eccentric one with relation to the other.

Referring again to Fig. 1, the lower portion of the circumferential wall 31 has an upward slope toward the front end as at 32, and herein this sloping portion is curved internally and externally. Moreover, the entire forward portion of the smoke-box gradually decreases in diameter toward its' front end. The form is such that there is no place for the lodgment'of cinders which would otherwise remaintliere, and, becoming incandescent, would in time destroy the This incandescence of the cinders occurs when thereis some false draft, due to leakage of air from bad joints in the smoke-box structure.

The front end of the smoke-box casting is provided with an opening 33, and about vbolts 35 are used, as in the present example,

to secure the front end or cover plate 36 in place, this flange provides a convenient means to prevent turning movement of the bolt heads, While the nuts 37 which are on the outside are being turned.

Referring now to Fig. 2, formed as integral parts of the circumferential wall 31 are lsteam pipes 38, which in the present example project internally and externally from the wall, and present passages from the interior to the exterior of the smokebox. By making these pipes integral with the smoke-box, the usual joints yat these points are eliminated. J ointed constructions work loose and admit air. By permanently preventing the entrance of air at these points, two advantages are gained: first, the draft due to vacuum induced by the exhaust nozzle is not impaired, and second, cinders lodging inside will not become incandescent when the locomotive is in operation. Herein, these steam pipes are provided with internal and external flanges 39 and 40, for the convenient attachment of other portions of the steam pipe. A flange 41, also formed as an integral pait of the smoke-box casting about ke'ach steam pipe, affords a convenient abutment for the attachment of the usual lagging and jacket about the external portion ofthe steam pipe.

In case the throttle valve is located in the forward upper portion of the smoke-box, as in the present example, there is provided a neck or boss 42 formed as an integral part thereof, and projecting upward from the circumferential wall 31; and this neck presents an opening 43 and a seat 44 for the usual fire-resisting packing about the neck of the throttle valve case 45, which is indicated in dotted lines in Fig. 1. This packing is usually held in place by a gland 46, indicatedin dotted lines. By forming this neck or boss as an integral part of the smoke-box casting, joints which might otherwise leak and admit air, and which might become corroded by the action of the products of combustion, are avoided.

A stack 47 comprises an external, upwardv ly projecting portion 48, and an internal,

downwardly projecting portion 49, both formed as integral projections from the circumferential wall 31 of the smoke-box cast` ing. By forming both parts of the stack integrally with the smoke-box casting, joints at these points are avoided, andthe cost of manufacture is decreased, especially as it eliminates the necessity of bolts and packing. The depending portion of the stack is provided with integral projections 50 for the attachment of a usual petticoat pipe 51,

`indicated in dotted lines.

t saddle, and a smoke-box comprising a casting which rests on said saddle, saif casting having a circumferential wall which is thicker at its lower portion adjacent said saddle than it is at its upper portion.

3. A locomotive smoke-box comprising a casting having a circumferential wall which is gradually thickened .from its upper to its lower portion. f

4. A locomotive smoke-box comprising a casting presenting a circumferential wall having a gradually decreased thickness from its lower portion toward its upper portion.

5. A locomotive. smoke-box comprising a casting having a circumferential wall presenting an opening at its lower portion for the exhaust pipe, said wall having a greater thickness at its lower portion and about said opening than it has at its upper portion.

6. A locomotive smoke-box comprising a casting having a circumferential wall presenting an opening for the exhaust pipe, said wall having an upward slope forward of said opening, said lower portion being relatively thicker than the upper portion `of said wall. l

7. A locomotive smoke-box comprising a casting having a circumferential wall whose diameter decreases toward its front end, said wall being provided with a flange presenting an opening, a. cover plate for said opening, and' bolts which extend through said cover plate and secure the latter to said casting.

8. A locomotive smoke-box comprising a casting having a circumferential wall whose lower portion curves upward internally and externally toward the front, the latter being provided with an opening, and a cover plate for said opening.

9. A locomotive smoke-box comprising a casting having a circumferential wall and` steam-pipes formed as integral parts thereof, and presenting passages from the interior to the exterior of the smoke-box'.

10. A locomotive smoke-box comprising a casting having a circumferential wall and steam pipes formed as integral parts thereof projecting internally and externallyI from said wall and presenting passages from the interior to the exterior of the smoke-box.

11. A locomotive smoke-box comprising a casting having a circumferential wall, a steam pipe formed as an integral part thereof and presenting a passage from the interior to the exterior of the smoke-box, and a flange formed as an integral part thereof projecting from the external surface of said wall about said pipe.

12. A locomotive smoke-box comprising a castinghaving a circumferential wall, an a steam pipe formed as an integral part thereof and presenting a passage from the interior to the exterior of the smoke-box, said pipe having an integral flange.

13. A locomotive smoke-box comprising-a` casting having a circumferential wall and a throttle support formed as an integral part of said wall and presenting an` opening through the latter.

14. A locomotive smoke-box comprising a' casting having a circumferential wall and a throttle support comprising a neck formed as an integral part of and projecting. from said wall, and presenting van integral vseat for the throttle valve case.

15. A locomotive smoke-box comprising a.I

externally from said Wall, said neck prsenting an internally projecting throttle valve case seat formed as an integral part thereof.

16. A locomotive smoke-box comprising a casting presenting a circumferential Wall i and a stack comprising an external upwardly projecting portion and an internal downwardly projecting portion both formed as integral projections from said Wall.

17. A locomotive srnoke-box comprising a casting presenting a circumferential wall and a. stack comprising an internal downwardly projecting portion formed as an integral projection from said wall.

18. A locomotive smoke-box comprising a castingy presenting a circumferential Wall and a stack comprising an internal downwardly projecting portion formed as an integral projection from s id Wall, and having integral projections or the attachment of the petticoat pipe.

In testimony whereof, I have signed my name to this specification.

WILLIAM L. BEAN. 

